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Phase Separation in Ge-GeO2 Glasses.
HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
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The results reported here on a 7.5 mole percent excess Ge composition using differential scanning calorimetry have shown that a two-step phase separation mechanism is operative. A homogeneous Ge-GeO2 glass phase separates at 450C into amorphous GeO2 and amorphous GeO. The GeO phase separates at 570C into crystalline Ge and amorphous GeO2. Additional support for a two-step phase separation mechanism is provided by kinetic arguments based on the viscosity dependence on composition and on the structure of the amorphous GeO phase and its stability relative to the homogeneous Ge-GeO2 glass. Modified author abstract
APPROVED FOR PUBLIC RELEASE